I just installed a 750 IBS in my 08 Outback V. Fits perfectly with about 3" of locker access left (more locker underneath but seat opening is around 3"). I piggy backed from front top (vent) of my 400# floor bag into the right lower port of the IBS. Had to drill inside starboard locker to get hose to and from center ski locker. No vent yet in the IBS, just burp it the first fill. Worked great last time out, and drained well when done.

I can take more pics if needed of the specific install. Here's the surf wave with 750s full in rear, 400 under floor, and 750 ibs



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